Patch "dmaengine: dw-edma: Fix readq_ch() return value truncation" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

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

    dmaengine: dw-edma: Fix readq_ch() return value truncation

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:
     dmaengine-dw-edma-fix-readq_ch-return-value-truncati.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.



commit 168f939131d47ccc1876c01c719a2deb9405f87c
Author: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx>
Date:   Wed Jan 25 18:19:00 2023 +0300

    dmaengine: dw-edma: Fix readq_ch() return value truncation
    
    [ Upstream commit 5fdca4a995bcd4cf61bda40af154a730589dc524 ]
    
    Previously, readq_ch() did a 64-bit readq(), but truncated the result by
    storing it in the u32 "value".  Change "value" to u64 to avoid the
    truncation.
    
    Note: the method is currently unused, so the bug hasn't caused any problem
    so far.
    
    Fixes: 04e0a39fc10f ("dmaengine: dw-edma: Add writeq() and readq() for 64 bits architectures")
    Signed-off-by: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/dma/dw-edma/dw-edma-v0-core.c b/drivers/dma/dw-edma/dw-edma-v0-core.c
index b5b8f8181e776..043a4f3115fa3 100644
--- a/drivers/dma/dw-edma/dw-edma-v0-core.c
+++ b/drivers/dma/dw-edma/dw-edma-v0-core.c
@@ -192,7 +192,7 @@ static inline void writeq_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch,
 static inline u64 readq_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch,
 			   const void __iomem *addr)
 {
-	u32 value;
+	u64 value;
 
 	if (dw->mf == EDMA_MF_EDMA_LEGACY) {
 		u32 viewport_sel;