linux-kernel - RE: [PATCH v2] [SCSI] bfa: allocate memory with GFP

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Date:	Wed, 30 Apr 2014 08:55:21 +0000
From:	Anil Gurumurthy <Anil.Gurumurthy@...gic.com>
To:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Sudarsana Kalluru <Sudarsana.Kalluru@...gic.com>
CC:	"James E.J. Bottomley" <JBottomley@...allels.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"ldv-project@...uxtesting.org" <ldv-project@...uxtesting.org>
Subject: RE: [PATCH v2] [SCSI] bfa: allocate memory with GFP_ATOMIC in
 spinlock context

Thanks for the patch.
Acked-by: Anil Gurumurthy <anil.gurumurthy@...gic.com>

-----Original Message-----
From: Alexey Khoroshilov [mailto:khoroshilov@...ras.ru]
Sent: 18 April 2014 13:29
To: Anil Gurumurthy; Sudarsana Kalluru
Cc: Alexey Khoroshilov; James E.J. Bottomley; linux-scsi; linux-kernel; ldv-project@...uxtesting.org
Subject: [PATCH v2] [SCSI] bfa: allocate memory with GFP_ATOMIC in spinlock context

bfa_fcb_pbc_vport_create() is called only from bfa_fcs_pbc_vport_init(), that is called only from bfad_drv_start() with bfad_lock spinlock held.
So the patch replaces GFP_KERNEL with GFP_ATOMIC to avoid sleeping in atomic spinlock context.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/scsi/bfa/bfad.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/bfa/bfad.c b/drivers/scsi/bfa/bfad.c index cc0fbcdc5192..7593b7c1d336 100644
--- a/drivers/scsi/bfa/bfad.c
+++ b/drivers/scsi/bfa/bfad.c
@@ -507,7 +507,7 @@ bfa_fcb_pbc_vport_create(struct bfad_s *bfad, struct bfi_pbc_vport_s pbc_vport)
        struct bfad_vport_s   *vport;
        int rc;

-       vport = kzalloc(sizeof(struct bfad_vport_s), GFP_KERNEL);
+       vport = kzalloc(sizeof(struct bfad_vport_s), GFP_ATOMIC);
        if (!vport) {
                bfa_trc(bfad, 0);
                return;
--
1.8.3.2


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