diff options
| author | Andrew Morton <akpm@osdl.org> | 2006-04-14 14:52:14 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-04-24 09:56:03 -0700 |
| commit | 1d7e3fb722af33e03840d8e93d479ad078871d61 (patch) | |
| tree | 856a62d9e17972e03a9bf17f9b32e124b25ef5b6 | |
| parent | 9d395d1961a0eeb9e8b1ef2854f3ca8f0b985266 (diff) | |
[PATCH] 3ware: kmap_atomic() fix
We must disable local IRQs while holding KM_IRQ0 or KM_IRQ1. Otherwise, an
IRQ handler could use those kmap slots while this code is using them,
resulting in memory corruption.
Thanks to Nick Orlov <bugfixer@list.ru> for reporting.
Cc: <linuxraid@amcc.com>
Cc: James Bottomley <James.Bottomley@SteelEye.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/scsi/3w-xxxx.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/scsi/3w-xxxx.c b/drivers/scsi/3w-xxxx.c index 25f678d0780b..e8e41e6eb42a 100644 --- a/drivers/scsi/3w-xxxx.c +++ b/drivers/scsi/3w-xxxx.c @@ -1508,10 +1508,12 @@ static void tw_transfer_internal(TW_Device_Extension *tw_dev, int request_id, struct scsi_cmnd *cmd = tw_dev->srb[request_id]; void *buf; unsigned int transfer_len; + unsigned long flags = 0; if (cmd->use_sg) { struct scatterlist *sg = (struct scatterlist *)cmd->request_buffer; + local_irq_save(flags); buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset; transfer_len = min(sg->length, len); } else { @@ -1526,6 +1528,7 @@ static void tw_transfer_internal(TW_Device_Extension *tw_dev, int request_id, sg = (struct scatterlist *)cmd->request_buffer; kunmap_atomic(buf - sg->offset, KM_IRQ0); + local_irq_restore(flags); } } |