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authorLinus Torvalds <torvalds@linux-foundation.org>2017-09-01 15:03:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-01 15:03:13 -0700
commitf8c6d7246a380fd8d13ebc3f7dac2495dc53db47 (patch)
treee7d6dfd31f99aed57411e927a755e6ac3b7eb2fb
parent138e4ad67afd5c6c318b056b4d17c17f2c0ca5c0 (diff)
parent231d069fcde22bd0582c2c9564f1b334d280c7d7 (diff)
Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c fixes from Wolfram Sang: "The ismt driver had a problem with a rarely used transaction type and the designware driver was made even more robust against non standard ACPI tables" * 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: i2c: designware: Round down ACPI provided clk to nearest supported clk i2c: ismt: Return EMSGSIZE for block reads with bogus length i2c: ismt: Don't duplicate the receive length for block reads
-rw-r--r--drivers/i2c/busses/i2c-designware-platdrv.c16
-rw-r--r--drivers/i2c/busses/i2c-ismt.c6
2 files changed, 16 insertions, 6 deletions
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 57248bccadbc..2b98a173136f 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -256,7 +256,8 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
struct dw_i2c_dev *dev;
u32 acpi_speed, ht = 0;
struct resource *mem;
- int irq, ret;
+ int i, irq, ret;
+ const int supported_speeds[] = { 0, 100000, 400000, 1000000, 3400000 };
irq = platform_get_irq(pdev, 0);
if (irq < 0)
@@ -297,9 +298,16 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
}
acpi_speed = i2c_acpi_find_bus_speed(&pdev->dev);
- /* Some broken DSTDs use 1MiHz instead of 1MHz */
- if (acpi_speed == 1048576)
- acpi_speed = 1000000;
+ /*
+ * Some DSTDs use a non standard speed, round down to the lowest
+ * standard speed.
+ */
+ for (i = 1; i < ARRAY_SIZE(supported_speeds); i++) {
+ if (acpi_speed < supported_speeds[i])
+ break;
+ }
+ acpi_speed = supported_speeds[i - 1];
+
/*
* Find bus speed from the "clock-frequency" device property, ACPI
* or by using fast mode if neither is set.
diff --git a/drivers/i2c/busses/i2c-ismt.c b/drivers/i2c/busses/i2c-ismt.c
index e98e44e584a4..22ffcb73c185 100644
--- a/drivers/i2c/busses/i2c-ismt.c
+++ b/drivers/i2c/busses/i2c-ismt.c
@@ -341,8 +341,10 @@ static int ismt_process_desc(const struct ismt_desc *desc,
break;
case I2C_SMBUS_BLOCK_DATA:
case I2C_SMBUS_I2C_BLOCK_DATA:
- memcpy(&data->block[1], dma_buffer, desc->rxbytes);
- data->block[0] = desc->rxbytes;
+ if (desc->rxbytes != dma_buffer[0] + 1)
+ return -EMSGSIZE;
+
+ memcpy(data->block, dma_buffer, desc->rxbytes);
break;
}
return 0;