From: Russell King <rmk+kernel@armlinux.org.uk>
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 4/8] ARM: riscpc: fix DMA
Date: Mon, 20 May 2019 15:47:09 +0100 [thread overview]
Message-ID: <E1hSjZF-0000Y2-CA@rmk-PC.armlinux.org.uk> (raw)
In-Reply-To: <20190520144615.gzrztyhoncyfc5xr@shell.armlinux.org.uk>
DMA got broken a while back in two different ways:
1) a change in the behaviour of disable_irq() to wait for the interrupt
to finish executing causes us to deadlock at the end of DMA.
2) a change to avoid modifying the scatterlist left the first transfer
uninitialised.
DMA is only used with expansion cards, so has gone unnoticed.
Fixes: fa4e99899932 ("[ARM] dma: RiscPC: don't modify DMA SG entries")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
arch/arm/mach-rpc/dma.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-rpc/dma.c b/arch/arm/mach-rpc/dma.c
index fb48f3141fb4..c4c96661eb89 100644
--- a/arch/arm/mach-rpc/dma.c
+++ b/arch/arm/mach-rpc/dma.c
@@ -131,7 +131,7 @@ static irqreturn_t iomd_dma_handle(int irq, void *dev_id)
} while (1);
idma->state = ~DMA_ST_AB;
- disable_irq(irq);
+ disable_irq_nosync(irq);
return IRQ_HANDLED;
}
@@ -174,6 +174,9 @@ static void iomd_enable_dma(unsigned int chan, dma_t *dma)
DMA_FROM_DEVICE : DMA_TO_DEVICE);
}
+ idma->dma_addr = idma->dma.sg->dma_address;
+ idma->dma_len = idma->dma.sg->length;
+
iomd_writeb(DMA_CR_C, dma_base + CR);
idma->state = DMA_ST_AB;
}
--
2.7.4
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next prev parent reply other threads:[~2019-05-20 14:47 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-20 14:46 [PATCH 0/8] Resurect RiscPC support Russell King - ARM Linux admin
2019-05-20 14:46 ` [PATCH 1/8] ARM: riscpc: replace gettimeoffset() with clocksource Russell King
2019-05-20 14:46 ` [PATCH 2/8] ARM: riscpc: fix lack of keyboard interrupts after irq conversion Russell King
2019-05-20 14:47 ` [PATCH 3/8] ARM: riscpc: fix ecard printing Russell King
2019-05-20 14:47 ` Russell King [this message]
2019-05-20 14:47 ` [PATCH 5/8] ARM: riscpc: dma: eliminate "cur_sg" scatterlist usage Russell King
2019-05-20 14:47 ` [PATCH 6/8] ARM: riscpc: dma: make state a local variable Russell King
2019-05-20 14:47 ` [PATCH 7/8] ARM: riscpc: dma: improve address/length writing Russell King
2019-05-20 14:47 ` [PATCH 8/8] ARM: riscpc: dma: use __iomem pointers for writing DMA Russell King
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