4.4-stable review patch. If anyone has any objections, please let me know.
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From: Shanker Donthineni shankerd@codeaurora.org
commit 1a485f4d2e28efd77075b2952926683d6c245633 upstream.
The current ITS driver has a memory leak in its_free_tables(). It happens on tear down path of the driver when its_probe() call fails. its_free_tables() should free the exact number of pages that have been allocated, not just a single page as current code does.
This patch records the memory size for each ITS_BASERn at the time of page allocation and uses the same size information when freeing pages to fix the issue.
Signed-off-by: Shanker Donthineni shankerd@codeaurora.org Acked-by: Marc Zyngier marc.zyngier@arm.com Cc: Jason Cooper jason@lakedaemon.net Cc: Vikram Sethi vikrams@codeaurora.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1454379584-21772-1-git-send-email-shankerd@codeauro... Signed-off-by: Thomas Gleixner tglx@linutronix.de Signed-off-by: Hanjun Guo hanjun.guo@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/irqchip/irq-gic-v3-its.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-)
--- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -67,7 +67,10 @@ struct its_node { unsigned long phys_base; struct its_cmd_block *cmd_base; struct its_cmd_block *cmd_write; - void *tables[GITS_BASER_NR_REGS]; + struct { + void *base; + u32 order; + } tables[GITS_BASER_NR_REGS]; struct its_collection *collections; struct list_head its_device_list; u64 flags; @@ -816,9 +819,10 @@ static void its_free_tables(struct its_n int i;
for (i = 0; i < GITS_BASER_NR_REGS; i++) { - if (its->tables[i]) { - free_page((unsigned long)its->tables[i]); - its->tables[i] = NULL; + if (its->tables[i].base) { + free_pages((unsigned long)its->tables[i].base, + its->tables[i].order); + its->tables[i].base = NULL; } } } @@ -899,7 +903,8 @@ retry_alloc_baser: goto out_free; }
- its->tables[i] = base; + its->tables[i].base = base; + its->tables[i].order = order;
retry_baser: val = (virt_to_phys(base) | @@ -949,7 +954,7 @@ retry_baser: * something is horribly wrong... */ free_pages((unsigned long)base, order); - its->tables[i] = NULL; + its->tables[i].base = NULL;
switch (psz) { case SZ_16K: