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| author | Kees Cook <keescook@chromium.org> | 2018-06-29 11:51:07 -0700 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2018-07-02 17:46:24 +0530 |
| commit | e6a785116df09f07c8d185fb18211d2bbacb047b (patch) | |
| tree | 97a7f7df406b79014a9c21fe7c547fd183ca37a9 | |
| parent | ce397d215ccd07b8ae3f71db689aedb85d56ab40 (diff) | |
| download | linux-e6a785116df09f07c8d185fb18211d2bbacb047b.tar.gz linux-e6a785116df09f07c8d185fb18211d2bbacb047b.tar.bz2 linux-e6a785116df09f07c8d185fb18211d2bbacb047b.zip | |
dmaengine: ste_dma40: Remove VLA usage
In the quest to remove all stack VLA usage from the kernel[1], this
switches to using a pre-allocated scratch register space, set up with
all other other allocations.
[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
| -rw-r--r-- | drivers/dma/ste_dma40.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c index 1bc149af990e..f4edfc56f34e 100644 --- a/drivers/dma/ste_dma40.c +++ b/drivers/dma/ste_dma40.c @@ -555,6 +555,7 @@ struct d40_gen_dmac { * @reg_val_backup_v4: Backup of registers that only exits on dma40 v3 and * later * @reg_val_backup_chan: Backup data for standard channel parameter registers. + * @regs_interrupt: Scratch space for registers during interrupt. * @gcc_pwr_off_mask: Mask to maintain the channels that can be turned off. * @gen_dmac: the struct for generic registers values to represent u8500/8540 * DMA controller @@ -592,6 +593,7 @@ struct d40_base { u32 reg_val_backup[BACKUP_REGS_SZ]; u32 reg_val_backup_v4[BACKUP_REGS_SZ_MAX]; u32 *reg_val_backup_chan; + u32 *regs_interrupt; u16 gcc_pwr_off_mask; struct d40_gen_dmac gen_dmac; }; @@ -1637,7 +1639,7 @@ static irqreturn_t d40_handle_interrupt(int irq, void *data) struct d40_chan *d40c; unsigned long flags; struct d40_base *base = data; - u32 regs[base->gen_dmac.il_size]; + u32 *regs = base->regs_interrupt; struct d40_interrupt_lookup *il = base->gen_dmac.il; u32 il_size = base->gen_dmac.il_size; @@ -3258,13 +3260,22 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev) if (!base->lcla_pool.alloc_map) goto free_backup_chan; + base->regs_interrupt = kmalloc_array(base->gen_dmac.il_size, + sizeof(*base->regs_interrupt), + GFP_KERNEL); + if (!base->regs_interrupt) + goto free_map; + base->desc_slab = kmem_cache_create(D40_NAME, sizeof(struct d40_desc), 0, SLAB_HWCACHE_ALIGN, NULL); if (base->desc_slab == NULL) - goto free_map; + goto free_regs; + return base; + free_regs: + kfree(base->regs_interrupt); free_map: kfree(base->lcla_pool.alloc_map); free_backup_chan: |