lkml.org 
[lkml]   [2016]   [Sep]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] [SCSI] wd719x: Avoid calling request_firmware under spinlock
From
Date
On 15/09/2016 14:48, Vaishali Thakkar wrote:
> It is preferrable to use request_firmware where sleeping is
> allowed. Using it under spinlock can cause blocking. Here,
> the function wd719x_chip_init calls request_firmware while
> holding a spinlock. So, let's access it outside the spinlock.
>
> Coccinelle is used to detect the issue.
>
> Signed-off-by: Vaishali Thakkar <vaishali.thakkar@oracle.com>
> ---
> Please note that the patch is compile-tested only. And this change
> may require driver testing.
> ---
> drivers/scsi/wd719x.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/wd719x.c b/drivers/scsi/wd719x.c
> index e3da1a2..b8e57f3 100644
> --- a/drivers/scsi/wd719x.c
> +++ b/drivers/scsi/wd719x.c
> @@ -518,13 +518,14 @@ static int wd719x_host_reset(struct scsi_cmnd *cmd)
> int result;
>
> dev_info(&wd->pdev->dev, "host reset requested\n");
> - spin_lock_irqsave(wd->sh->host_lock, flags);
> +

In the version of code I have flags is only used for this spinlock, so
can flags be removed?

> /* Try to reinit the RISC */
> if (wd719x_chip_init(wd) == 0)
> result = SUCCESS;
> else
> result = FAILED;
>
> + spin_lock_irqsave(wd->sh->host_lock, flags);
> /* flush all SCBs */
> list_for_each_entry_safe(scb, tmp, &wd->active_scbs, list) {
> struct scsi_cmnd *tmp_cmd = scb->cmd;
>


\
 
 \ /
  Last update: 2016-09-17 09:59    [W:0.054 / U:0.168 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site