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Signed-off-by: Keith Busch --- mm/dmapool.c | 96 +++++++++++++++++++++++++++++----------------------- 1 file changed, 54 insertions(+), 42 deletions(-) diff --git a/mm/dmapool.c b/mm/dmapool.c index eaed3ffb42aa8..8a7aa19e650a1 100644 --- a/mm/dmapool.c +++ b/mm/dmapool.c @@ -294,6 +294,32 @@ void dma_pool_destroy(struct dma_pool *pool) } EXPORT_SYMBOL(dma_pool_destroy); =20 +static inline void pool_check_block(struct dma_pool *pool, void *retval, + unsigned int offset, gfp_t mem_flags) +{ +#ifdef DMAPOOL_DEBUG + int i; + u8 *data =3D retval; + /* page->offset is stored in first 4 bytes */ + for (i =3D sizeof(offset); i < pool->size; i++) { + if (data[i] =3D=3D POOL_POISON_FREED) + continue; + dev_err(pool->dev, "%s %s, %p (corrupted)\n", + __func__, pool->name, retval); + + /* + * Dump the first 4 bytes even if they are not + * POOL_POISON_FREED + */ + print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 16, 1, + data, pool->size, 1); + break; + } + if (!want_init_on_alloc(mem_flags)) + memset(retval, POOL_POISON_ALLOCATED, pool->size); +#endif +} + /** * dma_pool_alloc - get a block of consistent memory * @pool: dma pool that will produce the block @@ -336,29 +362,7 @@ void *dma_pool_alloc(struct dma_pool *pool, gfp_t me= m_flags, page->offset =3D *(int *)(page->vaddr + offset); retval =3D offset + page->vaddr; *handle =3D offset + page->dma; -#ifdef DMAPOOL_DEBUG - { - int i; - u8 *data =3D retval; - /* page->offset is stored in first 4 bytes */ - for (i =3D sizeof(page->offset); i < pool->size; i++) { - if (data[i] =3D=3D POOL_POISON_FREED) - continue; - dev_err(pool->dev, "%s %s, %p (corrupted)\n", - __func__, pool->name, retval); - - /* - * Dump the first 4 bytes even if they are not - * POOL_POISON_FREED - */ - print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 16, 1, - data, pool->size, 1); - break; - } - } - if (!want_init_on_alloc(mem_flags)) - memset(retval, POOL_POISON_ALLOCATED, pool->size); -#endif + pool_check_block(pool, retval, offset, mem_flags); spin_unlock_irqrestore(&pool->lock, flags); =20 if (want_init_on_alloc(mem_flags)) @@ -381,6 +385,32 @@ static struct dma_page *pool_find_page(struct dma_po= ol *pool, dma_addr_t dma) return NULL; } =20 +static inline bool pool_page_err(struct dma_pool *pool, struct dma_page = *page, + void *vaddr) +{ +#ifdef DMAPOOL_DEBUG + unsigned int chain =3D page->offset; + + if ((dma - page->dma) !=3D offset) { + dev_err(pool->dev, "%s %s, %p (bad vaddr)/%pad\n", + __func__, pool->name, vaddr, &dma); + return true; + } + + while (chain < pool->allocation) { + if (chain !=3D offset) { + chain =3D *(int *)(page->vaddr + chain); + continue; + } + dev_err(pool->dev, "%s %s, dma %pad already free\n", + __func__, pool->name, &dma); + return true; + } + memset(vaddr, POOL_POISON_FREED, pool->size); +#endif + return false; +} + /** * dma_pool_free - put block back into dma pool * @pool: the dma pool holding the block @@ -408,28 +438,10 @@ void dma_pool_free(struct dma_pool *pool, void *vad= dr, dma_addr_t dma) offset =3D vaddr - page->vaddr; if (want_init_on_free()) memset(vaddr, 0, pool->size); -#ifdef DMAPOOL_DEBUG - if ((dma - page->dma) !=3D offset) { + if (pool_page_err(pool, page, vaddr)) { spin_unlock_irqrestore(&pool->lock, flags); - dev_err(pool->dev, "%s %s, %p (bad vaddr)/%pad\n", - __func__, pool->name, vaddr, &dma); return; } - { - unsigned int chain =3D page->offset; - while (chain < pool->allocation) { - if (chain !=3D offset) { - chain =3D *(int *)(page->vaddr + chain); - continue; - } - spin_unlock_irqrestore(&pool->lock, flags); - dev_err(pool->dev, "%s %s, dma %pad already free\n", - __func__, pool->name, &dma); - return; - } - } - memset(vaddr, POOL_POISON_FREED, pool->size); -#endif =20 page->in_use--; *(int *)vaddr =3D page->offset; --=20 2.30.2