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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/usb/host/ohci-hcd.c
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@@ -16,7 +16,7 @@
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  * OHCI is the main "non-Intel/VIA" standard for USB 1.1 host controller
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  * interfaces (though some non-x86 Intel chips use it).  It supports
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  * smarter hardware than UHCI.  A download link for the spec available
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- * through the http://www.usb.org website.
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+ * through the https://www.usb.org website.
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  *
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  * This file is licenced under the GPL.
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  */
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@@ -40,6 +40,7 @@
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 #include <linux/dmapool.h>
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 #include <linux/workqueue.h>
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 #include <linux/debugfs.h>
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+#include <linux/genalloc.h>
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 #include <asm/io.h>
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 #include <asm/irq.h>
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@@ -384,7 +385,7 @@
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 			ed_free (ohci, ed);
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 			break;
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 		}
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-		/* fall through */
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+		fallthrough;
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 	default:
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 		/* caller was supposed to have unlinked any requests;
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 		 * that's not our job.  can't recover; must leak ed.
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@@ -456,7 +457,7 @@
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 	struct usb_hcd *hcd = ohci_to_hcd(ohci);
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 	/* Accept arbitrarily long scatter-gather lists */
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-	if (!(hcd->driver->flags & HCD_LOCAL_MEM))
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+	if (!hcd->localmem_pool)
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 		hcd->self.sg_tablesize = ~0;
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 	if (distrust_firmware)
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@@ -514,8 +515,15 @@
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 	timer_setup(&ohci->io_watchdog, io_watchdog_func, 0);
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 	ohci->prev_frame_no = IO_WATCHDOG_OFF;
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-	ohci->hcca = dma_alloc_coherent (hcd->self.controller,
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-			sizeof(*ohci->hcca), &ohci->hcca_dma, GFP_KERNEL);
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+	if (hcd->localmem_pool)
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+		ohci->hcca = gen_pool_dma_alloc_align(hcd->localmem_pool,
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+						sizeof(*ohci->hcca),
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+						&ohci->hcca_dma, 256);
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+	else
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+		ohci->hcca = dma_alloc_coherent(hcd->self.controller,
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+						sizeof(*ohci->hcca),
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+						&ohci->hcca_dma,
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+						GFP_KERNEL);
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 	if (!ohci->hcca)
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 		return -ENOMEM;
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@@ -1003,9 +1011,14 @@
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 	remove_debug_files (ohci);
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 	ohci_mem_cleanup (ohci);
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 	if (ohci->hcca) {
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-		dma_free_coherent (hcd->self.controller,
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-				sizeof *ohci->hcca,
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-				ohci->hcca, ohci->hcca_dma);
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+		if (hcd->localmem_pool)
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+			gen_pool_free(hcd->localmem_pool,
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+				      (unsigned long)ohci->hcca,
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+				      sizeof(*ohci->hcca));
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+		else
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+			dma_free_coherent(hcd->self.controller,
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+					  sizeof(*ohci->hcca),
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+					  ohci->hcca, ohci->hcca_dma);
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 		ohci->hcca = NULL;
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 		ohci->hcca_dma = 0;
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 	}
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@@ -1042,7 +1055,7 @@
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 			ed->ed_next = ohci->ed_rm_list;
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 			ed->ed_prev = NULL;
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 			ohci->ed_rm_list = ed;
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-			/* FALLTHROUGH */
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+			fallthrough;
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 		case ED_UNLINK:
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 			break;
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 		default:
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@@ -1178,7 +1191,7 @@
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 	 * generic hardware linkage
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 	*/
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 	.irq =                  ohci_irq,
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-	.flags =                HCD_MEMORY | HCD_USB11,
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+	.flags =                HCD_MEMORY | HCD_DMA | HCD_USB11,
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 	/*
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 	* basic lifecycle operations