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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH v2 18/29] mci: allocate sector_buf on demand
Date: Sat, 19 Jun 2021 06:50:44 +0200	[thread overview]
Message-ID: <20210619045055.779-19-a.fatoum@pengutronix.de> (raw)
In-Reply-To: <20210619045055.779-1-a.fatoum@pengutronix.de>

The MCI core uses a common bounce buffer for unaligned block
reads/writes as well as sd_change_freq. This buffer is allocated at
device initcall level, same as the MMC drivers themselves.

For CONFIG_MCI_STARTUP=y configurations this seems to imply that
sd_change_freq could attempt writing the NULL page. Avoid this
by just allocating the buffer when the first MMC device is registered.

This doesn't solve all issues; so add a comment noting that.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 drivers/mci/mci-core.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
index b174067a7fbc..92a73c8f1dfe 100644
--- a/drivers/mci/mci-core.c
+++ b/drivers/mci/mci-core.c
@@ -1790,6 +1790,11 @@ static int mci_card_probe(struct mci *mci)
 		mci->cdevname = basprintf("disk%d", disknum);
 	}
 
+	if (!sector_buf)
+		sector_buf = dma_alloc(SECTOR_SIZE);
+
+	/* FIXME we don't check sector_buf against the device dma mask here */
+
 	rc = mci_startup(mci);
 	if (rc) {
 		dev_warn(&mci->dev, "Card's startup fails with %d\n", rc);
@@ -1851,15 +1856,6 @@ static int mci_set_probe(struct param_d *param, void *priv)
 	return 0;
 }
 
-static int mci_init(void)
-{
-	sector_buf = dma_alloc(SECTOR_SIZE);
-
-	return 0;
-}
-
-device_initcall(mci_init);
-
 int mci_detect_card(struct mci_host *host)
 {
 	int rc;
-- 
2.29.2


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  parent reply	other threads:[~2021-06-19  4:52 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-19  4:50 [PATCH v2 00/29] RISC-V: add BeagleV Beta board support Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 01/29] clocksource: RISC-V: demote probe success messages to debug level Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 02/29] RISC-V: virt: select only one timer Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 03/29] RISC-V: extend multi-image to support both S- and M-Mode Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 04/29] RISC-V: cpuinfo: return some output for non-SBI systems as well Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 05/29] RISC-V: S-Mode: propagate Hart ID Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 06/29] RISC-V: erizo: make it easier to reuse ns16550 debug_ll Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 07/29] RISC-V: socs: add Kconfig entry for StarFive JH7100 Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 08/29] nvmem: add StarFive OTP support Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 09/29] RISC-V: dma: support multiple dma_alloc_coherent backends Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 10/29] RISC-V: add exception support Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 11/29] RISC-V: support incoherent I-Cache Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 12/29] drivers: soc: sifive: add basic L2 cache controller driver Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 13/29] soc: starfive: add support for JH7100 incoherent interconnect Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 14/29] soc: sifive: l2_cache: enable maximum available cache ways Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 15/29] net: designware: fix non-1:1 mapped 64-bit systems Ahmad Fatoum
2021-06-21  7:25   ` Sascha Hauer
2021-06-21  7:33     ` Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 16/29] net: designware: add support for IP integrated into StarFive SoC Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 17/29] mci: allocate DMA-able memory Ahmad Fatoum
2021-06-19  4:50 ` Ahmad Fatoum [this message]
2021-06-19  4:50 ` [PATCH v2 19/29] dma: allocate 32-byte aligned buffers by default Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 20/29] mci: dw_mmc: add optional reset line Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 21/29] mci: dw_mmc: match against StarFive MMC compatibles Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 22/29] clk: add initial StarFive clock support Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 23/29] reset: add StarFive reset controller driver Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 24/29] watchdog: add StarFive watchdog driver Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 25/29] hw_random: add driver for RNG on StarFive SoC Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 26/29] reset: add device_reset_all helper Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 27/29] gpio: add support for StarFive GPIO controller Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 28/29] misc: add power sequencing driver for initializing StarFive peripherals Ahmad Fatoum
2021-06-19  4:50 ` [PATCH v2 29/29] RISC-V: StarFive: add board support for BeagleV Starlight Ahmad Fatoum
2021-06-21  9:11 ` [PATCH v2 00/29] RISC-V: add BeagleV Beta board support Sascha Hauer

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