From b555aa66760f17df4a0a5e4b440816e390311a38 Mon Sep 17 00:00:00 2001 From: Ondrej Zary Date: Thu, 5 Oct 2023 22:55:56 +0200 Subject: [PATCH 1/5] ata: pata_parport: fix pata_parport_devchk There's a 'x' missing in 0x55 in pata_parport_devchk(), causing the detection to always fail. Fix it. Fixes: 246a1c4c6b7f ("ata: pata_parport: add driver (PARIDE replacement)") Cc: stable@vger.kernel.org Signed-off-by: Ondrej Zary Reviewed-by: Sergey Shtylyov Signed-off-by: Damien Le Moal --- drivers/ata/pata_parport/pata_parport.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/ata/pata_parport/pata_parport.c b/drivers/ata/pata_parport/pata_parport.c index 1af64d435d3c..258d189f42e5 100644 --- a/drivers/ata/pata_parport/pata_parport.c +++ b/drivers/ata/pata_parport/pata_parport.c @@ -64,7 +64,7 @@ static bool pata_parport_devchk(struct ata_port *ap, unsigned int device) pi->proto->write_regr(pi, 0, ATA_REG_NSECT, 0xaa); pi->proto->write_regr(pi, 0, ATA_REG_LBAL, 0x55); - pi->proto->write_regr(pi, 0, ATA_REG_NSECT, 055); + pi->proto->write_regr(pi, 0, ATA_REG_NSECT, 0x55); pi->proto->write_regr(pi, 0, ATA_REG_LBAL, 0xaa); nsect = pi->proto->read_regr(pi, 0, ATA_REG_NSECT); From d2302427c12277929c9f390adeda19fbf403c0bb Mon Sep 17 00:00:00 2001 From: Ondrej Zary Date: Thu, 5 Oct 2023 22:55:57 +0200 Subject: [PATCH 2/5] ata: pata_parport: implement set_devctl Add missing ops->sff_set_devctl implementation. Fixes: 246a1c4c6b7f ("ata: pata_parport: add driver (PARIDE replacement)") Cc: stable@vger.kernel.org Signed-off-by: Ondrej Zary Reviewed-by: Sergey Shtylyov Signed-off-by: Damien Le Moal --- drivers/ata/pata_parport/pata_parport.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/ata/pata_parport/pata_parport.c b/drivers/ata/pata_parport/pata_parport.c index 258d189f42e5..cf87bbb52f1f 100644 --- a/drivers/ata/pata_parport/pata_parport.c +++ b/drivers/ata/pata_parport/pata_parport.c @@ -51,6 +51,13 @@ static void pata_parport_dev_select(struct ata_port *ap, unsigned int device) ata_sff_pause(ap); } +static void pata_parport_set_devctl(struct ata_port *ap, u8 ctl) +{ + struct pi_adapter *pi = ap->host->private_data; + + pi->proto->write_regr(pi, 1, 6, ctl); +} + static bool pata_parport_devchk(struct ata_port *ap, unsigned int device) { struct pi_adapter *pi = ap->host->private_data; @@ -252,6 +259,7 @@ static struct ata_port_operations pata_parport_port_ops = { .hardreset = NULL, .sff_dev_select = pata_parport_dev_select, + .sff_set_devctl = pata_parport_set_devctl, .sff_check_status = pata_parport_check_status, .sff_check_altstatus = pata_parport_check_altstatus, .sff_tf_load = pata_parport_tf_load, From f343e578fef99a69b3322aca38b94a6d8ded2ce7 Mon Sep 17 00:00:00 2001 From: Ondrej Zary Date: Thu, 5 Oct 2023 22:55:58 +0200 Subject: [PATCH 3/5] ata: pata_parport: add custom version of wait_after_reset Some parallel adapters (e.g. EXP Computer MC-1285B EPP Cable) return bogus values when there's no master device present. This can cause reset to fail, preventing the lone slave device (such as EXP Computer CD-865) from working. Add custom version of wait_after_reset that ignores master failure when a slave device is present. The custom version is also needed because the generic ata_sff_wait_after_reset uses direct port I/O for slave device detection. Signed-off-by: Ondrej Zary Reviewed-by: Sergey Shtylyov Signed-off-by: Damien Le Moal --- drivers/ata/pata_parport/pata_parport.c | 68 ++++++++++++++++++++++++- 1 file changed, 67 insertions(+), 1 deletion(-) diff --git a/drivers/ata/pata_parport/pata_parport.c b/drivers/ata/pata_parport/pata_parport.c index cf87bbb52f1f..a7adfdcb5e27 100644 --- a/drivers/ata/pata_parport/pata_parport.c +++ b/drivers/ata/pata_parport/pata_parport.c @@ -80,6 +80,72 @@ static bool pata_parport_devchk(struct ata_port *ap, unsigned int device) return (nsect == 0x55) && (lbal == 0xaa); } +static int pata_parport_wait_after_reset(struct ata_link *link, + unsigned int devmask, + unsigned long deadline) +{ + struct ata_port *ap = link->ap; + struct pi_adapter *pi = ap->host->private_data; + unsigned int dev0 = devmask & (1 << 0); + unsigned int dev1 = devmask & (1 << 1); + int rc, ret = 0; + + ata_msleep(ap, ATA_WAIT_AFTER_RESET); + + /* always check readiness of the master device */ + rc = ata_sff_wait_ready(link, deadline); + if (rc) { + /* + * some adapters return bogus values if master device is not + * present, so don't abort now if a slave device is present + */ + if (!dev1) + return rc; + ret = -ENODEV; + } + + /* + * if device 1 was found in ata_devchk, wait for register + * access briefly, then wait for BSY to clear. + */ + if (dev1) { + int i; + + pata_parport_dev_select(ap, 1); + + /* + * Wait for register access. Some ATAPI devices fail + * to set nsect/lbal after reset, so don't waste too + * much time on it. We're gonna wait for !BSY anyway. + */ + for (i = 0; i < 2; i++) { + u8 nsect, lbal; + + nsect = pi->proto->read_regr(pi, 0, ATA_REG_NSECT); + lbal = pi->proto->read_regr(pi, 0, ATA_REG_LBAL); + if (nsect == 1 && lbal == 1) + break; + /* give drive a breather */ + ata_msleep(ap, 50); + } + + rc = ata_sff_wait_ready(link, deadline); + if (rc) { + if (rc != -ENODEV) + return rc; + ret = rc; + } + } + + pata_parport_dev_select(ap, 0); + if (dev1) + pata_parport_dev_select(ap, 1); + if (dev0) + pata_parport_dev_select(ap, 0); + + return ret; +} + static int pata_parport_bus_softreset(struct ata_port *ap, unsigned int devmask, unsigned long deadline) { @@ -94,7 +160,7 @@ static int pata_parport_bus_softreset(struct ata_port *ap, unsigned int devmask, ap->last_ctl = ap->ctl; /* wait the port to become ready */ - return ata_sff_wait_after_reset(&ap->link, devmask, deadline); + return pata_parport_wait_after_reset(&ap->link, devmask, deadline); } static int pata_parport_softreset(struct ata_link *link, unsigned int *classes, From 0c1e81d0b5ebd5813536dd5fcf5966ad043f37dc Mon Sep 17 00:00:00 2001 From: Ondrej Zary Date: Thu, 5 Oct 2023 22:55:59 +0200 Subject: [PATCH 4/5] ata: pata_parport: fit3: implement IDE command set registers fit3 protocol driver does not support accessing IDE control registers (device control/altstatus). The DOS driver does not use these registers either (as observed from DOSEMU trace). But the HW seems to be capable of accessing these registers - I simply tried bit 3 and it works! The control register is required to properly reset ATAPI devices or they will be detected only once (after a power cycle). Tested with EXP Computer CD-865 with MC-1285B EPP cable and TransDisk 3000. Signed-off-by: Ondrej Zary Reviewed-by: Sergey Shtylyov Signed-off-by: Damien Le Moal --- drivers/ata/pata_parport/fit3.c | 14 ++------------ 1 file changed, 2 insertions(+), 12 deletions(-) diff --git a/drivers/ata/pata_parport/fit3.c b/drivers/ata/pata_parport/fit3.c index bad7aa920cdc..d2b81cf2e16d 100644 --- a/drivers/ata/pata_parport/fit3.c +++ b/drivers/ata/pata_parport/fit3.c @@ -9,11 +9,6 @@ * * The TD-2000 and certain older devices use a different protocol. * Try the fit2 protocol module with them. - * - * NB: The FIT adapters do not appear to support the control - * registers. So, we map ALT_STATUS to STATUS and NO-OP writes - * to the device control register - this means that IDE reset - * will not work on these devices. */ #include @@ -37,8 +32,7 @@ static void fit3_write_regr(struct pi_adapter *pi, int cont, int regr, int val) { - if (cont == 1) - return; + regr += cont << 3; switch (pi->mode) { case 0: @@ -59,11 +53,7 @@ static int fit3_read_regr(struct pi_adapter *pi, int cont, int regr) { int a, b; - if (cont) { - if (regr != 6) - return 0xff; - regr = 7; - } + regr += cont << 3; switch (pi->mode) { case 0: From 626b13f015e080e434b1dee9a0c116ddbf4fb695 Mon Sep 17 00:00:00 2001 From: Damien Le Moal Date: Wed, 4 Oct 2023 17:50:49 +0900 Subject: [PATCH 5/5] scsi: Do not rescan devices with a suspended queue Commit ff48b37802e5 ("scsi: Do not attempt to rescan suspended devices") modified scsi_rescan_device() to avoid attempting rescanning a suspended device. However, the modification added a check to verify that a SCSI device is in the running state without checking if the device request queue (in the case of block device) is also running, thus allowing the exectuion of internal requests. Without checking the device request queue, commit ff48b37802e5 fix is incomplete and deadlocks on resume can still happen. Use blk_queue_pm_only() to check if the device request queue allows executing commands in addition to checking the SCSI device state. Reported-by: Petr Tesarik Fixes: ff48b37802e5 ("scsi: Do not attempt to rescan suspended devices") Cc: stable@vger.kernel.org Tested-by: Petr Tesarik Reviewed-by: Martin K. Petersen Signed-off-by: Damien Le Moal --- drivers/scsi/scsi_scan.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 902655d75947..44680f65ea14 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -1627,12 +1627,13 @@ int scsi_rescan_device(struct scsi_device *sdev) device_lock(dev); /* - * Bail out if the device is not running. Otherwise, the rescan may - * block waiting for commands to be executed, with us holding the - * device lock. This can result in a potential deadlock in the power - * management core code when system resume is on-going. + * Bail out if the device or its queue are not running. Otherwise, + * the rescan may block waiting for commands to be executed, with us + * holding the device lock. This can result in a potential deadlock + * in the power management core code when system resume is on-going. */ - if (sdev->sdev_state != SDEV_RUNNING) { + if (sdev->sdev_state != SDEV_RUNNING || + blk_queue_pm_only(sdev->request_queue)) { ret = -EWOULDBLOCK; goto unlock; }