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bnx2fc: reduce stack usage in __bnx2fc_enable 

When the bnx2fc driver was changed to read the npiv table from
nvram, the stack of the __bnx2fc_enable function gained an
additional 1028 byte structure that gcc rightfully warns about:

drivers/scsi/bnx2fc/bnx2fc_fcoe.c: In function '__bnx2fc_enable':
drivers/scsi/bnx2fc/bnx2fc_fcoe.c:2134:1: warning: the frame size of 1128 bytes is larger than 1024 bytes [-Wframe-larger-than=]

In order to avoid a possible kernel stack overflow and to get rid
of the warning, this changes the function to use a dynamic allocation
of the structure using kzalloc.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 2971ff67bd ("bnx2fc: Read npiv table from nvram and create vports.")
Acked-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
This commit is contained in:
Arnd Bergmann 2015-10-07 15:11:04 +02:00 committed by James Bottomley
parent e795042365
commit 720ba808e9
1 changed files with 9 additions and 4 deletions
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13
drivers/scsi/bnx2fc/bnx2fc_fcoe.c
View File

@ -2091,7 +2091,7 @@ static int __bnx2fc_enable(struct fcoe_ctlr *ctlr)
{
struct bnx2fc_interface *interface = fcoe_ctlr_priv(ctlr);
struct bnx2fc_hba *hba;
struct cnic_fc_npiv_tbl npiv_tbl;
struct cnic_fc_npiv_tbl *npiv_tbl;
struct fc_lport *lport;
if (interface->enabled == false) {
@ -2123,11 +2123,16 @@ static int __bnx2fc_enable(struct fcoe_ctlr *ctlr)
if (!hba->cnic->get_fc_npiv_tbl)
goto done;
memset(&npiv_tbl, 0, sizeof(npiv_tbl));
if (hba->cnic->get_fc_npiv_tbl(hba->cnic, &npiv_tbl))
npiv_tbl = kzalloc(sizeof(struct cnic_fc_npiv_tbl), GFP_KERNEL);
if (!npiv_tbl)
goto done;
bnx2fc_npiv_create_vports(lport, &npiv_tbl);
if (hba->cnic->get_fc_npiv_tbl(hba->cnic, npiv_tbl))
goto done_free;
bnx2fc_npiv_create_vports(lport, npiv_tbl);
done_free:
kfree(npiv_tbl);
done:
return 0;
}