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cw1200: Don't perform SPI transfers in interrupt context

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When we get an interrupt from the hardware, the first thing the driver does
is tell the device to mask off the interrupt line.  Unfortunately this
involves a SPI transaction in interrupt context.  Some (most?) SPI
controllers perform the transfer asynchronously and try to sleep.
This is bad, and triggers a BUG().

So, work around this by using adding a hwbus hook for the cw1200 driver
core to call.  The cw1200_spi driver translates this into
irq_disable()/irq_enable() calls instead, which can safely be called in
interrupt context.

Apparently the platforms I used to develop the cw1200_spi driver used
synchronous spi_sync() implementations, which is why this didn't surface
until now.

Many thanks to Dave Sizeburns for the inital bug report and his services
as a tester.

Signed-off-by: Solomon Peachy <pizza@shaftnet.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Solomon Peachy 2013-08-27 20:29:46 -04:00 committed by John W. Linville
parent e7d33bb5ea
commit aec8e88c94
4 changed files with 33 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/net/wireless/cw1200/cw1200_spi.c
View File

@ -41,6 +41,7 @@ struct hwbus_priv {
const struct cw1200_platform_data_spi *pdata;
spinlock_t lock; /* Serialize all bus operations */
int claimed;
int irq_disabled;
};
#define SDIO_TO_SPI_ADDR(addr) ((addr & 0x1f)>>2)
@ -230,6 +231,8 @@ static irqreturn_t cw1200_spi_irq_handler(int irq, void *dev_id)
struct hwbus_priv *self = dev_id;
if (self->core) {
disable_irq_nosync(self->func->irq);
self->irq_disabled = 1;
cw1200_irq_handler(self->core);
return IRQ_HANDLED;
} else {
@ -263,13 +266,22 @@ exit:
static int cw1200_spi_irq_unsubscribe(struct hwbus_priv *self)
{
int ret = 0;
pr_debug("SW IRQ unsubscribe\n");
disable_irq_wake(self->func->irq);
free_irq(self->func->irq, self);
return ret;
return 0;
}
static int cw1200_spi_irq_enable(struct hwbus_priv *self, int enable)
{
/* Disables are handled by the interrupt handler */
if (enable && self->irq_disabled) {
enable_irq(self->func->irq);
self->irq_disabled = 0;
}
return 0;
}
static int cw1200_spi_off(const struct cw1200_platform_data_spi *pdata)
@ -349,6 +361,7 @@ static struct hwbus_ops cw1200_spi_hwbus_ops = {
.unlock = cw1200_spi_unlock,
.align_size = cw1200_spi_align_size,
.power_mgmt = cw1200_spi_pm,
.irq_enable = cw1200_spi_irq_enable,
};
/* Probe Function to be called by SPI stack when device is discovered */

2
drivers/net/wireless/cw1200/fwio.c
View File

@ -485,7 +485,7 @@ int cw1200_load_firmware(struct cw1200_common *priv)
/* Enable interrupt signalling */
priv->hwbus_ops->lock(priv->hwbus_priv);
ret = __cw1200_irq_enable(priv, 1);
ret = __cw1200_irq_enable(priv, 2);
priv->hwbus_ops->unlock(priv->hwbus_priv);
if (ret < 0)
goto unsubscribe;

1
drivers/net/wireless/cw1200/hwbus.h
View File

@ -28,6 +28,7 @@ struct hwbus_ops {
void (*unlock)(struct hwbus_priv *self);
size_t (*align_size)(struct hwbus_priv *self, size_t size);
int (*power_mgmt)(struct hwbus_priv *self, bool suspend);
int (*irq_enable)(struct hwbus_priv *self, int enable);
};
#endif /* CW1200_HWBUS_H */

15
drivers/net/wireless/cw1200/hwio.c
View File

@ -273,6 +273,21 @@ int __cw1200_irq_enable(struct cw1200_common *priv, int enable)
u16 val16;
int ret;
/* We need to do this hack because the SPI layer can sleep on I/O
and the general path involves I/O to the device in interrupt
context.
However, the initial enable call needs to go to the hardware.
We don't worry about shutdown because we do a full reset which
clears the interrupt enabled bits.
*/
if (priv->hwbus_ops->irq_enable) {
ret = priv->hwbus_ops->irq_enable(priv->hwbus_priv, enable);
if (ret || enable < 2)
return ret;
}
if (HIF_8601_SILICON == priv->hw_type) {
ret = __cw1200_reg_read_32(priv, ST90TDS_CONFIG_REG_ID, &val32);
if (ret < 0) {