iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

floppy: don't use PREPARE_[DELAYED_]WORK

Browse Source 
PREPARE_[DELAYED_]WORK() are being phased out.  They have few users
and a nasty surprise in terms of reentrancy guarantee as workqueue
considers work items to be different if they don't have the same work
function.

floppy has been multiplexing floppy_work and fd_timer with multiple
work functions.  Introduce floppy_work_workfn() and fd_timer_workfn()
which invoke floppy_work_fn and fd_timer_fn respectively and always
use the two functions as the work functions and update the users to
set floppy_work_fn and fd_timer_fn instead of overriding work
functions using PREPARE_[DELAYED_]WORK().

It would probably be best to route this with other related updates
through the workqueue tree.

Lightly tested using qemu.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Tejun Heo 2014-03-07 10:24:48 -05:00
parent 4a8bb7f548
commit 75ddb38f09
1 changed files with 28 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
drivers/block/floppy.c
View File

@ -961,17 +961,31 @@ static void empty(void)
{
}
static DECLARE_WORK(floppy_work, NULL);
static void (*floppy_work_fn)(void);
static void floppy_work_workfn(struct work_struct *work)
{
floppy_work_fn();
}
static DECLARE_WORK(floppy_work, floppy_work_workfn);
static void schedule_bh(void (*handler)(void))
{
WARN_ON(work_pending(&floppy_work));
PREPARE_WORK(&floppy_work, (work_func_t)handler);
floppy_work_fn = handler;
queue_work(floppy_wq, &floppy_work);
}
static DECLARE_DELAYED_WORK(fd_timer, NULL);
static void (*fd_timer_fn)(void) = NULL;
static void fd_timer_workfn(struct work_struct *work)
{
fd_timer_fn();
}
static DECLARE_DELAYED_WORK(fd_timer, fd_timer_workfn);
static void cancel_activity(void)
{
@ -982,7 +996,7 @@ static void cancel_activity(void)
/* this function makes sure that the disk stays in the drive during the
* transfer */
static void fd_watchdog(struct work_struct *arg)
static void fd_watchdog(void)
{
debug_dcl(DP->flags, "calling disk change from watchdog\n");
@ -993,7 +1007,7 @@ static void fd_watchdog(struct work_struct *arg)
reset_fdc();
} else {
cancel_delayed_work(&fd_timer);
PREPARE_DELAYED_WORK(&fd_timer, fd_watchdog);
fd_timer_fn = fd_watchdog;
queue_delayed_work(floppy_wq, &fd_timer, HZ / 10);
}
}
@ -1005,7 +1019,8 @@ static void main_command_interrupt(void)
}
/* waits for a delay (spinup or select) to pass */
static int fd_wait_for_completion(unsigned long expires, work_func_t function)
static int fd_wait_for_completion(unsigned long expires,
void (*function)(void))
{
if (FDCS->reset) {
reset_fdc(); /* do the reset during sleep to win time
@ -1016,7 +1031,7 @@ static int fd_wait_for_completion(unsigned long expires, work_func_t function)
if (time_before(jiffies, expires)) {
cancel_delayed_work(&fd_timer);
PREPARE_DELAYED_WORK(&fd_timer, function);
fd_timer_fn = function;
queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies);
return 1;
}
@ -1334,8 +1349,7 @@ static int fdc_dtr(void)
* Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
*/
FDCS->dtr = raw_cmd->rate & 3;
return fd_wait_for_completion(jiffies + 2UL * HZ / 100,
(work_func_t)floppy_ready);
return fd_wait_for_completion(jiffies + 2UL * HZ / 100, floppy_ready);
} /* fdc_dtr */
static void tell_sector(void)
@ -1440,7 +1454,7 @@ static void setup_rw_floppy(void)
int flags;
int dflags;
unsigned long ready_date;
work_func_t function;
void (*function)(void);
flags = raw_cmd->flags;
if (flags & (FD_RAW_READ | FD_RAW_WRITE))
@ -1454,9 +1468,9 @@ static void setup_rw_floppy(void)
*/
if (time_after(ready_date, jiffies + DP->select_delay)) {
ready_date -= DP->select_delay;
function = (work_func_t)floppy_start;
function = floppy_start;
} else
function = (work_func_t)setup_rw_floppy;
function = setup_rw_floppy;
/* wait until the floppy is spinning fast enough */
if (fd_wait_for_completion(ready_date, function))
@ -1486,7 +1500,7 @@ static void setup_rw_floppy(void)
inr = result();
cont->interrupt();
} else if (flags & FD_RAW_NEED_DISK)
fd_watchdog(NULL);
fd_watchdog();
}
static int blind_seek;
@ -1863,7 +1877,7 @@ static int start_motor(void (*function)(void))
/* wait_for_completion also schedules reset if needed. */
return fd_wait_for_completion(DRS->select_date + DP->select_delay,
(work_func_t)function);
function);
}
static void floppy_ready(void)