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From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
To: sathya.prakash@broadcom.com, sreekanth.reddy@broadcom.com,
	suganath-prabu.subramani@broadcom.com, jejb@linux.ibm.com,
	martin.petersen@oracle.com, linux-scsi@vger.kernel.org
Cc: MPT-FusionLinux.pdl@broadcom.com, linux-kernel@vger.kernel.org,
	kernel-janitors@vger.kernel.org,
	Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Subject: [PATCH] scsi: mpt3sas: Do not use GFP_KERNEL in atomic context
Date: Sat, 20 Feb 2021 10:39:51 +0100	[thread overview]
Message-ID: <20210220093951.905362-1-christophe.jaillet@wanadoo.fr> (raw)

'mpt3sas_get_port_by_id()' can be called when a spinlock is hold. So use
GFP_ATOMIC instead of GFP_KERNEL when allocating memory.

Issue spotted by call_kern.cocci:
./drivers/scsi/mpt3sas/mpt3sas_scsih.c:416:42-52: ERROR: function mpt3sas_get_port_by_id called on line 7125 inside lock on line 7123 but uses GFP_KERNEL
./drivers/scsi/mpt3sas/mpt3sas_scsih.c:416:42-52: ERROR: function mpt3sas_get_port_by_id called on line 6842 inside lock on line 6839 but uses GFP_KERNEL
./drivers/scsi/mpt3sas/mpt3sas_scsih.c:416:42-52: ERROR: function mpt3sas_get_port_by_id called on line 6854 inside lock on line 6851 but uses GFP_KERNEL
./drivers/scsi/mpt3sas/mpt3sas_scsih.c:416:42-52: ERROR: function mpt3sas_get_port_by_id called on line 7706 inside lock on line 7702 but uses GFP_KERNEL
./drivers/scsi/mpt3sas/mpt3sas_scsih.c:416:42-52: ERROR: function mpt3sas_get_port_by_id called on line 10260 inside lock on line 10256 but uses GFP_KERNEL

Fixes: 324c122fc0a4 ("scsi: mpt3sas: Add module parameter multipath_on_hba")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
 drivers/scsi/mpt3sas/mpt3sas_scsih.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index ffca03064797..6aa6de729187 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -413,7 +413,7 @@ mpt3sas_get_port_by_id(struct MPT3SAS_ADAPTER *ioc,
 	 * And add this object to port_table_list.
 	 */
 	if (!ioc->multipath_on_hba) {
-		port = kzalloc(sizeof(struct hba_port), GFP_KERNEL);
+		port = kzalloc(sizeof(struct hba_port), GFP_ATOMIC);
 		if (!port)
 			return NULL;
 
-- 
2.27.0


             reply	other threads:[~2021-02-20  9:42 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-20  9:39 Christophe JAILLET [this message]
2021-03-19  3:45 ` [PATCH] scsi: mpt3sas: Do not use GFP_KERNEL in atomic context Martin K. Petersen

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