linux-kernel - [PATCH] scsi: message: fusion: Use GFP_KERNEL instead of GFP

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Message-Id: <eccb2179ce800529851ed4fabc9d3f95fbbf7d7f.1644906731.git.christophe.jaillet@wanadoo.fr>
Date:   Tue, 15 Feb 2022 07:32:34 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Sathya Prakash <sathya.prakash@...adcom.com>,
        Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
        Suganath Prabu Subramani 
        <suganath-prabu.subramani@...adcom.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        MPT-FusionLinux.pdl@...adcom.com, linux-scsi@...r.kernel.org
Subject: [PATCH] scsi: message: fusion: Use GFP_KERNEL instead of GFP_ATOMIC in non-atomic context

Just a few lines below this kzalloc() we have a mutex_lock() which can
sleep.

More over, the only way to call this function is when a delayed work is
schedule. And delayed work can sleep.
  INIT_DELAYED_WORK(&fw_event->work, mptsas_firmware_event_work);
    --> mptsas_firmware_event_work()
      --> mptsas_send_link_status_event()
        --> mptsas_expander_add()

So there is really no good reason to use GFP_ATOMIC here. Change it to
GFP_KERNEL to give more opportunities to the kernel.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/message/fusion/mptsas.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/message/fusion/mptsas.c b/drivers/message/fusion/mptsas.c
index 4acd8f9a48e1..34901bcd1ce8 100644
--- a/drivers/message/fusion/mptsas.c
+++ b/drivers/message/fusion/mptsas.c
@@ -3680,7 +3680,7 @@ mptsas_expander_add(MPT_ADAPTER *ioc, u16 handle)
 	    MPI_SAS_EXPAND_PGAD_FORM_SHIFT), handle)))
 		return NULL;
 
-	port_info = kzalloc(sizeof(struct mptsas_portinfo), GFP_ATOMIC);
+	port_info = kzalloc(sizeof(struct mptsas_portinfo), GFP_KERNEL);
 	if (!port_info) {
 		dfailprintk(ioc, printk(MYIOC_s_ERR_FMT
 		"%s: exit at line=%d\n", ioc->name,
-- 
2.32.0