Patch "Revert "s390/ism: fix receive message buffer allocation"" has been added to the 6.8-stable tree

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

    Revert "s390/ism: fix receive message buffer allocation"

to the 6.8-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:
     revert-s390-ism-fix-receive-message-buffer-allocatio.patch
and it can be found in the queue-6.8 subdirectory.

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



commit 8568beeed3944bd4bf4c3683993a9df6ae53fbb7
Author: Gerd Bayer <gbayer@xxxxxxxxxxxxx>
Date:   Tue Apr 9 13:37:53 2024 +0200

    Revert "s390/ism: fix receive message buffer allocation"
    
    [ Upstream commit d51dc8dd6ab6f93a894ff8b38d3b8d02c98eb9fb ]
    
    This reverts commit 58effa3476536215530c9ec4910ffc981613b413.
    Review was not finished on this patch. So it's not ready for
    upstreaming.
    
    Signed-off-by: Gerd Bayer <gbayer@xxxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20240409113753.2181368-1-gbayer@xxxxxxxxxxxxx
    Fixes: 58effa347653 ("s390/ism: fix receive message buffer allocation")
    Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/s390/net/ism_drv.c b/drivers/s390/net/ism_drv.c
index affb05521e146..2c8e964425dc3 100644
--- a/drivers/s390/net/ism_drv.c
+++ b/drivers/s390/net/ism_drv.c
@@ -14,8 +14,6 @@
 #include <linux/err.h>
 #include <linux/ctype.h>
 #include <linux/processor.h>
-#include <linux/dma-mapping.h>
-#include <linux/mm.h>
 
 #include "ism.h"
 
@@ -294,15 +292,13 @@ static int ism_read_local_gid(struct ism_dev *ism)
 static void ism_free_dmb(struct ism_dev *ism, struct ism_dmb *dmb)
 {
 	clear_bit(dmb->sba_idx, ism->sba_bitmap);
-	dma_unmap_page(&ism->pdev->dev, dmb->dma_addr, dmb->dmb_len,
-		       DMA_FROM_DEVICE);
-	folio_put(virt_to_folio(dmb->cpu_addr));
+	dma_free_coherent(&ism->pdev->dev, dmb->dmb_len,
+			  dmb->cpu_addr, dmb->dma_addr);
 }
 
 static int ism_alloc_dmb(struct ism_dev *ism, struct ism_dmb *dmb)
 {
 	unsigned long bit;
-	int rc;
 
 	if (PAGE_ALIGN(dmb->dmb_len) > dma_get_max_seg_size(&ism->pdev->dev))
 		return -EINVAL;
@@ -319,30 +315,14 @@ static int ism_alloc_dmb(struct ism_dev *ism, struct ism_dmb *dmb)
 	    test_and_set_bit(dmb->sba_idx, ism->sba_bitmap))
 		return -EINVAL;
 
-	dmb->cpu_addr =
-		folio_address(folio_alloc(GFP_KERNEL | __GFP_NOWARN |
-					  __GFP_NOMEMALLOC | __GFP_NORETRY,
-					  get_order(dmb->dmb_len)));
+	dmb->cpu_addr = dma_alloc_coherent(&ism->pdev->dev, dmb->dmb_len,
+					   &dmb->dma_addr,
+					   GFP_KERNEL | __GFP_NOWARN |
+					   __GFP_NOMEMALLOC | __GFP_NORETRY);
+	if (!dmb->cpu_addr)
+		clear_bit(dmb->sba_idx, ism->sba_bitmap);
 
-	if (!dmb->cpu_addr) {
-		rc = -ENOMEM;
-		goto out_bit;
-	}
-	dmb->dma_addr = dma_map_page(&ism->pdev->dev,
-				     virt_to_page(dmb->cpu_addr), 0,
-				     dmb->dmb_len, DMA_FROM_DEVICE);
-	if (dma_mapping_error(&ism->pdev->dev, dmb->dma_addr)) {
-		rc = -ENOMEM;
-		goto out_free;
-	}
-
-	return 0;
-
-out_free:
-	kfree(dmb->cpu_addr);
-out_bit:
-	clear_bit(dmb->sba_idx, ism->sba_bitmap);
-	return rc;
+	return dmb->cpu_addr ? 0 : -ENOMEM;
 }
 
 int ism_register_dmb(struct ism_dev *ism, struct ism_dmb *dmb,




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