Patch "i2c: bcm-iproc: Fix bcm_iproc_i2c_isr deadlock issue" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    i2c: bcm-iproc: Fix bcm_iproc_i2c_isr deadlock issue

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     i2c-bcm-iproc-fix-bcm_iproc_i2c_isr-deadlock-issue.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 4caf4cb1eaed469742ef719f2cc024b1ec3fa9e6 Mon Sep 17 00:00:00 2001
From: Chengfeng Ye <dg573847474@xxxxxxxxx>
Date: Fri, 7 Jul 2023 08:49:41 +0000
Subject: i2c: bcm-iproc: Fix bcm_iproc_i2c_isr deadlock issue

From: Chengfeng Ye <dg573847474@xxxxxxxxx>

commit 4caf4cb1eaed469742ef719f2cc024b1ec3fa9e6 upstream.

iproc_i2c_rd_reg() and iproc_i2c_wr_reg() are called from both
interrupt context (e.g. bcm_iproc_i2c_isr) and process context
(e.g. bcm_iproc_i2c_suspend). Therefore, interrupts should be
disabled to avoid potential deadlock. To prevent this scenario,
use spin_lock_irqsave().

Fixes: 9a1038728037 ("i2c: iproc: add NIC I2C support")
Signed-off-by: Chengfeng Ye <dg573847474@xxxxxxxxx>
Acked-by: Ray Jui <ray.jui@xxxxxxxxxxxx>
Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/i2c/busses/i2c-bcm-iproc.c |   11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

--- a/drivers/i2c/busses/i2c-bcm-iproc.c
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -243,13 +243,14 @@ static inline u32 iproc_i2c_rd_reg(struc
 				   u32 offset)
 {
 	u32 val;
+	unsigned long flags;
 
 	if (iproc_i2c->idm_base) {
-		spin_lock(&iproc_i2c->idm_lock);
+		spin_lock_irqsave(&iproc_i2c->idm_lock, flags);
 		writel(iproc_i2c->ape_addr_mask,
 		       iproc_i2c->idm_base + IDM_CTRL_DIRECT_OFFSET);
 		val = readl(iproc_i2c->base + offset);
-		spin_unlock(&iproc_i2c->idm_lock);
+		spin_unlock_irqrestore(&iproc_i2c->idm_lock, flags);
 	} else {
 		val = readl(iproc_i2c->base + offset);
 	}
@@ -260,12 +261,14 @@ static inline u32 iproc_i2c_rd_reg(struc
 static inline void iproc_i2c_wr_reg(struct bcm_iproc_i2c_dev *iproc_i2c,
 				    u32 offset, u32 val)
 {
+	unsigned long flags;
+
 	if (iproc_i2c->idm_base) {
-		spin_lock(&iproc_i2c->idm_lock);
+		spin_lock_irqsave(&iproc_i2c->idm_lock, flags);
 		writel(iproc_i2c->ape_addr_mask,
 		       iproc_i2c->idm_base + IDM_CTRL_DIRECT_OFFSET);
 		writel(val, iproc_i2c->base + offset);
-		spin_unlock(&iproc_i2c->idm_lock);
+		spin_unlock_irqrestore(&iproc_i2c->idm_lock, flags);
 	} else {
 		writel(val, iproc_i2c->base + offset);
 	}


Patches currently in stable-queue which might be from dg573847474@xxxxxxxxx are

queue-5.15/i2c-bcm-iproc-fix-bcm_iproc_i2c_isr-deadlock-issue.patch



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