[PATCH 3/5] mmc: sdhci: fix align_buffer memory leak on re-initialization

[Kathpalia, Tanmay]

Hi Peng,

On 7/13/2026 2:12 PM, Peng Fan wrote:
> Hi Tanmay,
>
> On Mon, Jul 13, 2026 at 12:20:10AM +0530, Kathpalia, Tanmay wrote:
>> On 7/12/2026 6:37 PM, Peng Fan (OSS) wrote:
>>> From: Peng Fan <peng.fan at nxp.com>
>>>
>>> sdhci_init() allocates a 512KB aligned bounce buffer for controllers
>>> with SDHCI_QUIRK_32BIT_DMA_ADDR. In the non-DM code path, sdhci_init()
>>> is registered as ops->init and called on every mmc_init(). Each call
>>> allocates a new buffer without checking or freeing the previous one,
>>> leaking 512KB per re-initialization.
>>>
>>> Fix by guarding the allocation with !host->align_buffer so it only
>>> allocates on the first call.
>>>
>>> Signed-off-by: Peng Fan <peng.fan at nxp.com>
>> Signed-off-by: Tanmay Kathpalia <tanmay.kathpalia at altera.com>
> This should be R-b or A-b. I will use R-b if no objections.
>

Yes, R-b is fine.