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Bartosz Golaszewski 00f0ea70d2 eeprom: at24: check if the chip is functional in probe() 
The at24 driver doesn't check if the chip is functional in its probe
function. This leads to instantiating devices that are not physically
present. For example the cape EEPROMs for BeagleBone Black are defined
in the device tree at four addresses on i2c2, but normally only one of
them is present.

If the userspace doesn't know the location in advance, it will need to
check if reading the nvmem attributes fails to determine which EEPROM
is actually there.

Try to read a single byte in probe() and bail-out with -ENODEV if the
read fails.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 		2016-08-22 08:19:58 +02:00
..
altera-stapl drivers/misc/altera-stapl/altera.c: remove extraneous KERN_INFO prefix 2015-06-25 17:00:38 -07:00
c2port misc: c2port: use kobj_to_dev() 2016-02-07 23:01:45 -08:00
cb710
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cxl cxl: Set psl_fir_cntl to production environment value 2016-08-10 14:02:45 +10:00
echo
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eeprom eeprom: at24: check if the chip is functional in probe() 2016-08-22 08:19:58 +02:00
genwqe GenWQE: Use pci_(request|release)_mem_regions 2016-06-21 17:11:09 -05:00
ibmasm mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
lis3lv02d misc: apds990x, bh1770glc, lis3lv02d: use to_i2c_client 2016-02-07 23:01:45 -08:00
mei Merge 4.7-rc4 into char-misc-next 2016-06-25 07:29:44 -07:00
mic virtio/vhost: new features for 4.8 2016-08-06 09:20:13 -04:00
sgi-gru x86/platform/UV: Remove Obsolete GRU MMR address translation 2016-05-04 08:48:51 +02:00
sgi-xp mm: rename alloc_pages_exact_node() to __alloc_pages_node() 2015-09-08 15:35:28 -07:00
ti-st drivers: misc: ti-st: Use int instead of fuzzy char for callback status 2016-07-17 19:59:26 +02:00
vmw_vmci mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
Kconfig Merge char-misc-next into staging-next 2016-02-22 14:46:24 -08:00
Makefile lkdtm: Fix targets for objcopy usage 2016-08-01 14:27:24 -07:00
ad525x_dpot-i2c.c misc: ad525x_dpot: Remove unnecessary MODULE_ALIAS() 2015-09-20 19:33:29 -07:00
ad525x_dpot-spi.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
ad525x_dpot.c misc: ad525x_dpot: Fix the enabling of the "otpXen" attributes 2016-03-01 16:55:13 -08:00
ad525x_dpot.h
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apds990x.c misc: apds990x, bh1770glc, lis3lv02d: use to_i2c_client 2016-02-07 23:01:45 -08:00
apds9802als.c
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arm-charlcd.c drivers/misc: make arm-charlcd.c explicitly non-modular 2016-02-07 23:01:45 -08:00
atmel-ssc.c ASoC: atmel_ssc_dai: distinguish the different SSC 2016-03-02 23:43:11 +09:00
atmel_tclib.c misc: atmel_tclib: get and use slow clock 2015-10-06 12:33:14 +02:00
bh1770glc.c misc: apds990x, bh1770glc, lis3lv02d: use to_i2c_client 2016-02-07 23:01:45 -08:00
bh1780gli.c misc: bh1780: Add module aliases 2015-03-16 21:10:28 +01:00
bmp085-i2c.c misc: Drop owner assignment from i2c_driver 2015-08-10 08:37:35 +02:00
bmp085-spi.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
bmp085.c
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bmp085.h
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cs5535-mfgpt.c
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ds1682.c misc: ds1682: clean up ds1682_eeprom_read() and ds1682_eeprom_write() 2015-08-05 13:53:39 -07:00
dummy-irq.c
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enclosure.c enclosure: fix WARN_ON removing an adapter in multi-path devices 2015-03-31 08:53:36 +03:00
fsa9480.c
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hmc6352.c
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hpilo.c misc: hpilo: Change e-mail address from hp.com to hpe.com 2015-10-04 12:42:33 +01:00
hpilo.h
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ics932s401.c
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ioc4.c misc: ioc4: simplify wave period measurement in clock_calibrate 2015-01-12 05:04:11 -08:00
isl29003.c misc: Drop owner assignment from i2c_driver 2015-08-10 08:37:35 +02:00
isl29020.c
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kgdbts.c drivers/misc: make kgdbts.c slightly more explicitly non-modular 2015-09-20 19:32:35 -07:00
lattice-ecp3-config.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
lkdtm.h lkdtm: silence warnings about function declarations 2016-07-15 16:14:45 -07:00
lkdtm_bugs.c lkdtm: silence warnings about function declarations 2016-07-15 16:14:45 -07:00
lkdtm_core.c lkdtm: silence warnings about function declarations 2016-07-15 16:14:45 -07:00
lkdtm_heap.c lkdtm: silence warnings about function declarations 2016-07-15 16:14:45 -07:00
lkdtm_perms.c lkdtm: silence warnings about function declarations 2016-07-15 16:14:45 -07:00
lkdtm_rodata.c lkdtm: silence warnings about function declarations 2016-07-15 16:14:45 -07:00
lkdtm_usercopy.c lkdtm: fix false positive warning from -Wmaybe-uninitialized 2016-08-01 14:27:23 -07:00
panel.c misc: panel, convert struct to bitmap 2016-02-11 19:24:23 -08:00
pch_phub.c pch_phub: return -ENODATA if ROM can't be mapped 2016-03-05 12:19:39 -08:00
phantom.c
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pti.c
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qcom-coincell.c ARM: qcom: silence an uninitialized variable warning 2016-05-01 14:20:04 -07:00
spear13xx_pcie_gadget.c spear13xx_pcie_gadget: use per-attribute show and store methods 2015-10-13 22:17:40 -07:00
sram.c misc: sram: fix check of devm_ioremap*() return value 2016-04-30 14:15:56 -07:00
ti_dac7512.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
tifm_7xx1.c misc: tifm: match return type of wait_for_completion_timeout 2015-03-25 11:36:38 +01:00
tifm_core.c
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tsl2550.c misc: Drop owner assignment from i2c_driver 2015-08-10 08:37:35 +02:00
vexpress-syscfg.c ARM: vexpress: Remove non-DT code 2014-11-28 16:08:16 +01:00
vmw_balloon.c mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM 2015-11-06 17:50:42 -08:00