4.18-stable review patch. If anyone has any objections, please let me know.
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From: Jens Axboe axboe@kernel.dk
commit 52990a5fb0c991ecafebdab43138b5ed41376852 upstream.
We're only setting up the bounce bio sets if we happen to need bouncing for regular HIGHMEM, not if we only need it for ISA devices.
Protect the ISA bounce setup with a mutex, since it's being invoked from driver init functions and can thus be called in parallel.
Cc: stable@vger.kernel.org Reported-by: Ondrej Zary linux@rainbow-software.org Tested-by: Ondrej Zary linux@rainbow-software.org Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- block/bounce.c | 37 ++++++++++++++++++++++++++++--------- 1 file changed, 28 insertions(+), 9 deletions(-)
--- a/block/bounce.c +++ b/block/bounce.c @@ -31,6 +31,24 @@ static struct bio_set bounce_bio_set, bounce_bio_split; static mempool_t page_pool, isa_page_pool;
+static void init_bounce_bioset(void) +{ + static bool bounce_bs_setup; + int ret; + + if (bounce_bs_setup) + return; + + ret = bioset_init(&bounce_bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); + BUG_ON(ret); + if (bioset_integrity_create(&bounce_bio_set, BIO_POOL_SIZE)) + BUG_ON(1); + + ret = bioset_init(&bounce_bio_split, BIO_POOL_SIZE, 0, 0); + BUG_ON(ret); + bounce_bs_setup = true; +} + #if defined(CONFIG_HIGHMEM) static __init int init_emergency_pool(void) { @@ -44,14 +62,7 @@ static __init int init_emergency_pool(vo BUG_ON(ret); pr_info("pool size: %d pages\n", POOL_SIZE);
- ret = bioset_init(&bounce_bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); - BUG_ON(ret); - if (bioset_integrity_create(&bounce_bio_set, BIO_POOL_SIZE)) - BUG_ON(1); - - ret = bioset_init(&bounce_bio_split, BIO_POOL_SIZE, 0, 0); - BUG_ON(ret); - + init_bounce_bioset(); return 0; }
@@ -86,6 +97,8 @@ static void *mempool_alloc_pages_isa(gfp return mempool_alloc_pages(gfp_mask | GFP_DMA, data); }
+static DEFINE_MUTEX(isa_mutex); + /* * gets called "every" time someone init's a queue with BLK_BOUNCE_ISA * as the max address, so check if the pool has already been created. @@ -94,14 +107,20 @@ int init_emergency_isa_pool(void) { int ret;
- if (mempool_initialized(&isa_page_pool)) + mutex_lock(&isa_mutex); + + if (mempool_initialized(&isa_page_pool)) { + mutex_unlock(&isa_mutex); return 0; + }
ret = mempool_init(&isa_page_pool, ISA_POOL_SIZE, mempool_alloc_pages_isa, mempool_free_pages, (void *) 0); BUG_ON(ret);
pr_info("isa pool size: %d pages\n", ISA_POOL_SIZE); + init_bounce_bioset(); + mutex_unlock(&isa_mutex); return 0; }