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Sun, 11 Jan 2026 04:34:51 -0800 (PST) Received: from C-PF5BVJTJ.vpn.alcatel-lucent.com ([167.103.6.164]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c4cc95d5f10sm14707097a12.26.2026.01.11.04.34.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 11 Jan 2026 04:34:51 -0800 (PST) From: Karthikeyan K S To: hminas@synopsys.com, gregkh@linuxfoundation.org Cc: gregory.herrero@intel.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Karthikeyan K S Subject: [PATCH v2] usb: dwc2: add missing SLAB_CACHE_DMA flag for desc_hsisoc_cache Date: Sun, 11 Jan 2026 12:32:18 +0000 Message-ID: <20260111123218.15972-1-karthiproffesional@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The desc_hsisoc_cache kmem_cache is used to allocate DMA descriptors for High-Speed isochronous transfers. These descriptors are passed to the hardware via dma_map_single() in dwc2_desc_list_alloc(). The desc_gen_cache, which serves the same purpose for other transfer types, correctly specifies SLAB_CACHE_DMA. However, desc_hsisoc_cache was created without this flag, despite both caches being used identically for DMA descriptor allocation. Add the missing SLAB_CACHE_DMA flag to desc_hsisoc_cache for consistency and correctness on platforms with DMA zone restrictions. This also protects against future allocations from this cache that might omit GFP_DMA. Fixes: 3b5fcc9ac2f4 ("usb: dwc2: host: use kmem cache to allocate descriptors") Signed-off-by: Karthikeyan K S --- v2: Resend with proper formatting (previous was corrupted by email client) --- drivers/usb/dwc2/hcd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c index 30eb85066..556d6ab36 100644 --- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -5273,7 +5273,7 @@ int dwc2_hcd_init(struct dwc2_hsotg *hsotg) hsotg->desc_hsisoc_cache = kmem_cache_create("dwc2-hsisoc-desc", sizeof(struct dwc2_dma_desc) * - MAX_DMA_DESC_NUM_HS_ISOC, 512, 0, NULL); + MAX_DMA_DESC_NUM_HS_ISOC, 512, SLAB_CACHE_DMA, NULL); if (!hsotg->desc_hsisoc_cache) { dev_err(hsotg->dev, "unable to create dwc2 hs isoc desc cache\n"); -- 2.43.0