The patch titled
Subject: dmapool: remove checks for dev == NULL
has been added to the -mm mm-unstable branch. Its filename is
dmapool-remove-checks-for-dev-==-null.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/dmapool-remove-checks-for-dev-==-null.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Tony Battersby <tonyb@xxxxxxxxxxxxxxx>
Subject: dmapool: remove checks for dev == NULL
Date: Thu, 26 Jan 2023 13:51:15 -0800
dmapool originally tried to support pools without a device because
dma_alloc_coherent() supports allocations without a device. But nobody
ended up using dma pools without a device, and trying to do so will result
in an oops. So remove the checks for pool->dev == NULL since they are
unneeded bloat.
[kbusch@xxxxxxxxxx: add check for null dev on create]
Link: https://lkml.kernel.org/r/20230126215125.4069751-3-kbusch@xxxxxxxx
Signed-off-by: Tony Battersby <tonyb@xxxxxxxxxxxxxxx>
Signed-off-by: Keith Busch <kbusch@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/dmapool.c | 45 ++++++++++++++-------------------------------
1 file changed, 14 insertions(+), 31 deletions(-)
--- a/mm/dmapool.c~dmapool-remove-checks-for-dev-==-null
+++ a/mm/dmapool.c
@@ -134,6 +134,9 @@ struct dma_pool *dma_pool_create(const c
size_t allocation;
bool empty = false;
+ if (!dev)
+ return NULL;
+
if (align == 0)
align = 1;
else if (align & (align - 1))
@@ -275,7 +278,7 @@ void dma_pool_destroy(struct dma_pool *p
mutex_lock(&pools_reg_lock);
mutex_lock(&pools_lock);
list_del(&pool->pools);
- if (pool->dev && list_empty(&pool->dev->dma_pools))
+ if (list_empty(&pool->dev->dma_pools))
empty = true;
mutex_unlock(&pools_lock);
if (empty)
@@ -284,12 +287,8 @@ void dma_pool_destroy(struct dma_pool *p
list_for_each_entry_safe(page, tmp, &pool->page_list, page_list) {
if (is_page_busy(page)) {
- if (pool->dev)
- dev_err(pool->dev, "%s %s, %p busy\n", __func__,
- pool->name, page->vaddr);
- else
- pr_err("%s %s, %p busy\n", __func__,
- pool->name, page->vaddr);
+ dev_err(pool->dev, "%s %s, %p busy\n", __func__,
+ pool->name, page->vaddr);
/* leak the still-in-use consistent memory */
list_del(&page->page_list);
kfree(page);
@@ -351,12 +350,8 @@ void *dma_pool_alloc(struct dma_pool *po
for (i = sizeof(page->offset); i < pool->size; i++) {
if (data[i] == POOL_POISON_FREED)
continue;
- if (pool->dev)
- dev_err(pool->dev, "%s %s, %p (corrupted)\n",
- __func__, pool->name, retval);
- else
- pr_err("%s %s, %p (corrupted)\n",
- __func__, pool->name, retval);
+ dev_err(pool->dev, "%s %s, %p (corrupted)\n",
+ __func__, pool->name, retval);
/*
* Dump the first 4 bytes even if they are not
@@ -411,12 +406,8 @@ void dma_pool_free(struct dma_pool *pool
page = pool_find_page(pool, dma);
if (!page) {
spin_unlock_irqrestore(&pool->lock, flags);
- if (pool->dev)
- dev_err(pool->dev, "%s %s, %p/%pad (bad dma)\n",
- __func__, pool->name, vaddr, &dma);
- else
- pr_err("%s %s, %p/%pad (bad dma)\n",
- __func__, pool->name, vaddr, &dma);
+ dev_err(pool->dev, "%s %s, %p/%pad (bad dma)\n",
+ __func__, pool->name, vaddr, &dma);
return;
}
@@ -426,12 +417,8 @@ void dma_pool_free(struct dma_pool *pool
#ifdef DMAPOOL_DEBUG
if ((dma - page->dma) != offset) {
spin_unlock_irqrestore(&pool->lock, flags);
- if (pool->dev)
- dev_err(pool->dev, "%s %s, %p (bad vaddr)/%pad\n",
- __func__, pool->name, vaddr, &dma);
- else
- pr_err("%s %s, %p (bad vaddr)/%pad\n",
- __func__, pool->name, vaddr, &dma);
+ dev_err(pool->dev, "%s %s, %p (bad vaddr)/%pad\n",
+ __func__, pool->name, vaddr, &dma);
return;
}
{
@@ -442,12 +429,8 @@ void dma_pool_free(struct dma_pool *pool
continue;
}
spin_unlock_irqrestore(&pool->lock, flags);
- if (pool->dev)
- dev_err(pool->dev, "%s %s, dma %pad already free\n",
- __func__, pool->name, &dma);
- else
- pr_err("%s %s, dma %pad already free\n",
- __func__, pool->name, &dma);
+ dev_err(pool->dev, "%s %s, dma %pad already free\n",
+ __func__, pool->name, &dma);
return;
}
}
_
Patches currently in -mm which might be from tonyb@xxxxxxxxxxxxxxx are
dmapool-remove-checks-for-dev-==-null.patch
dmapool-use-sysfs_emit-instead-of-scnprintf.patch
dmapool-cleanup-integer-types.patch
dmapool-speedup-dmapool_debug-with-init_on_alloc.patch
